underfrequency
... underframe底架 underfrequency频率过低；低于额定频率 undergage尺寸不足 ...
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低于额定频率百分数卡 underfrequency pc card
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下超调下超调指电压调整器或控制器在应对负荷变化时，电压或频率低于额定的量。
Undershoot Undershoot refers to the amount by which voltage or frequency drops below the nominal value as the voltage regulator or governor responds to changes in load.
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